技術標籤：前端踩坑合集

寫一個div

<div class="triangle"></div>

1.向上

.triangle{
	width:0;
        height:0;
	border-right:50px solid transparent;
	border-left:50px solid transparent;
	border-bottom:50px solid red;
}

2.向下

.triangle{
	width:0;
	height:0;
	border-right:50px solid transparent;
	border-
 
left:50px solid transparent;
	border-top:50px solid red;
}

3.向左

.triangle{
    width:0;
    height:0;
    border-top:50px solid transparent;
    border-bottom:50px solid transparent;
    border-right:50px solid red;
}

4.向右

.triangle{
    width:0;
    height:0;
    border-top:50px solid transparent;
    border-
 
bottom:50px solid transparent;
    border-left:50px solid red;
}